William w



W. W. POTTS. LIMBKILN.

No. 73,998. Patented Peb. 4, 1868.

A@eine terneatwt @frn 'WILLIAM IOTTS, OF BRIDGEPORT7 PENNSYLVANIA.

Letters Patent No. 73,998, dated February 4, 1868.

IMPROVEMENT IN LIMEHKILNS.

TO ALL WHOM IT MAYICONCERN:

Be it known that I', WILLIAM W. Porre, of Bridgeport, in the county of Montgomery, and State of Pennsylvania, have invented a new and useful Improvement in .the Perpetual Lime-Kiln; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to theaccompany'ing drawings, making a part of this specification, in which- Figure 1 is, a vertical central section of the said improved kiln.

Figure 2, a horizontal section, just below the` dotted line w w, of iig. 1, and

.Figure 3 a horizontal section, just below the dotted line x ar, of iig. 1

Like letters of referencendicating the same parts when in the differents figures.

` The object of my improvement is to cconomize the fuel, and, also to effect a withdrawal, in a cooled state, of the burnt or decurbonate'd limestone without stopping the burning-operation upon the. carbonate above.

My invention consists, substantially as hereinafter described, first, in a kiln made nearly air-tight at its upper end; second, in simultaneously forcing fresh air, .through the fuel, into thekiln, for the purpose of igniting or burning the said fuel, and over or above the surface of the Asaid incandescent fuelin the furnaces for the purpose of iguiting the-gases arising therefrom; and, third, in forcing fresh air into the lower end of the kiln, below the lines of the furnaces. for the twofold purpose of cooling the burnt lime as it falls therein, and driving the said air, in a. het state, up, tnroughthc llames above, into the upper part of the kiln, and thus perfecting the combustion of all the combustible matter and gases.

Referring to the drawings, A B is the kiln; C C C C, the furnaces; D D, a channel around the kiln, for simultaneously supplying the several furnaces C with the requisite-fresh air; E E, a channel around the, kiln, and above the channel D, for simultaneously discharging fresh air over the fuel-surface of each of the furnaces C, indicated in fig. 2 by the dotted lines v o, and F F a channel around the lower end of the kiln, for. discharging fresh air into the same, for cooling the burnt limetherein.

The kilnl A B is made tapering toward the upper end, and is comparatively lower orcshorter than the perA petual kilns heretofore used. It has its upper end arched over, so as to leave only thesmall feed-hole a', which is provided with a loose cover, a, having a small openA vent-hole, a in its centre', for the discharge of any undecomposed carbonio acid, the object of closing the 'kilubeing to confine the gases until consumed. The lower end of the kiln A l? 'tapers downward from the dues of the furnaces C C, is closed at its bottom, b-, but has a side opening, b, for the withdrawal of the cooled lime. Y The furnaces C C are arranged so as to project radially, and at equal distances apart, around the outer side of the kiln, and so as to communicate therewith, and alsb receive the air which supports the combustion of their fuel from the channel D, it being forced into the latter through the radial channel d.

The channel. E communicates with each of the re-chambers of the furnaces C through the holes e', leading downward into the atter, and receives its supply of fresh air through the radial channel e.

The channel F communicates with the lower end of the kiln through the numerous small radial inlets, ff, and receives its supply of fresh air through theradial channel f.

Each of the three main linlet-cha.nnels, e, d, and f/, are intended. to communicate with the same airforcing apparatus that may be used, and the proper relative strength of the different currents regulated at will by means of appropriate valves to be applied thereto.

Operation The fresh air being steadily driven into the kiln A B, as described, the currents passing through the incandescent fuel in the furnaces C, -from the channel D, are joined in the lire-chambers, vabove the fuel, by the currents coming from the channel E, thus igniting or inilaming the rising combustible gases, and, together, driving the hot ilamesinto the centre of AIB, as indicated by the arrows e z in iig. 1, while, at the same time, the currents of fresh air coming from the channel F, in the lower end of the furnace, clfectually co9l the burnt lime as it falls therein; and thejsaid'air, passing in a highly-heated state directly upward toward the top of thev kiln, affords a copieussupply of fresh air, which, together with the currents from the channels Il and F, decm-v poses the carbonio acid, and, with the oxygen derivedfelfectually consumes Aall thecarbon and the balance of any combustible gases yet unburnt which may 11a-vo eomefrom the incandescent fuel in the furnaces, and, at the same time, allows the burnt or decarbonated limestone, as fastas it isproduccd', to be withdrawn fromthe kiln in a cooled state, through .the opening b at the bottom, thus economizing' the fuel, and affording facility in removing trie burnt lime as produced.

Having thus `fully described my improvement in the perpetual lime-kiln, what I claim as new therein of my invention, and desire to secure by Letters Patent, is coniined to the following, viz:

1. I cleim'arching over the upper end of the kiln A B, substantiallyes described, and covering the fee 1' hole a', left thereby, by means of' n removable cover, al', provided with the small vent-hole al, substantially as and for the purpose described and set-forth.

2. I claim the combination of the furnaces C and the channels VD and E, when the seme are constructed and arranged in the. relation to each other and to the kiln A B, us descrihednd set forth, for the purposes specified.

3. I also claim forcing the currents of air up through the lower part. ot' the kiln. and onward therein, by

means of the channel F, substantially as and for the purposes described.

WILLIAM W. IOlTS.

Witnesses:

BENI. MoRIsoN, WM. H. MomSoN, JOHN WHITE. 

